Algeria-Niger" or "Maro-Maure-Mali-Niger
In may 2009 we wanted to come up from Niger to Algeria.
We could go "at our own risk".
this is what the sittuation was that time:
There are still bandits who carjack cars.
Between the border and Arlit it is "piste" sand and once in a while a barrel to show you the way. not really a place to be left allone.
it is also there were these bandits operate.
Between Arlit and Agadez and between Agadez and the south of Niger there are Military convoys.
You are not allowed to leave the cities to explore the dessert even not with a travel agencie.
We took the save way back up: Burkina, Mali, Mauretania, Marroco.
Quite easy because if you want its al tar road.
that time you coudn't buy Mauretania visa at the border!
the rest was peanuts except the Custom officer at the Mauretania-Mali border at Gogui. That was the only place where we had to pay extra on our Carnet de Passage. (15 borders)
the best is to take very small borders but then you always need to get a visa in front.
have a nice journey